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cgroup: Add "no" prefixed mount options

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We allow modifying these mount options via remount. Let's add "no" prefixed
variants so that they can be turned off too.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Michal Koutný <mkoutny@suse.com>
This commit is contained in:
Tejun Heo 2022-07-14 18:38:43 -10:00
parent 671c11f061
commit 30312730bd
2 changed files with 18 additions and 8 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
Documentation/admin-guide/cgroup-v2.rst
View file

@ -177,14 +177,14 @@ disabling controllers in v1 and make them always available in v2.
cgroup v2 currently supports the following mount options. cgroup v2 currently supports the following mount options.
nsdelegate [no]nsdelegate
Consider cgroup namespaces as delegation boundaries. This Consider cgroup namespaces as delegation boundaries. This
option is system wide and can only be set on mount or modified option is system wide and can only be set on mount or modified
through remount from the init namespace. The mount option is through remount from the init namespace. The mount option is
ignored on non-init namespace mounts. Please refer to the ignored on non-init namespace mounts. Please refer to the
Delegation section for details. Delegation section for details.
memory_localevents memory_[no]localevents
Only populate memory.events with data for the current cgroup, Only populate memory.events with data for the current cgroup,
and not any subtrees. This is legacy behaviour, the default and not any subtrees. This is legacy behaviour, the default
behaviour without this option is to include subtree counts. behaviour without this option is to include subtree counts.
@ -192,7 +192,7 @@ cgroup v2 currently supports the following mount options.
modified through remount from the init namespace. The mount modified through remount from the init namespace. The mount
option is ignored on non-init namespace mounts. option is ignored on non-init namespace mounts.
memory_recursiveprot memory_[no]recursiveprot
Recursively apply memory.min and memory.low protection to Recursively apply memory.min and memory.low protection to
entire subtrees, without requiring explicit downward entire subtrees, without requiring explicit downward
propagation into leaf cgroups. This allows protecting entire propagation into leaf cgroups. This allows protecting entire

20
kernel/cgroup/cgroup.c
View file

@ -279,8 +279,6 @@ bool cgroup_ssid_enabled(int ssid)
* *
* - When mounting an existing superblock, mount options should match. * - When mounting an existing superblock, mount options should match.
* *
* - Remount is disallowed.
*
* - rename(2) is disallowed. * - rename(2) is disallowed.
* *
* - "tasks" is removed. Everything should be at process granularity. Use * - "tasks" is removed. Everything should be at process granularity. Use
@ -1859,16 +1857,19 @@ int cgroup_show_path(struct seq_file *sf, struct kernfs_node *kf_node,
} }
enum cgroup2_param { enum cgroup2_param {
Opt_nsdelegate, Opt_nsdelegate, Opt_nonsdelegate,
Opt_memory_localevents, Opt_memory_localevents, Opt_memory_nolocalevents,
Opt_memory_recursiveprot, Opt_memory_recursiveprot, Opt_memory_norecursiveprot,
nr__cgroup2_params nr__cgroup2_params
}; };
static const struct fs_parameter_spec cgroup2_fs_parameters[] = { static const struct fs_parameter_spec cgroup2_fs_parameters[] = {
fsparam_flag("nsdelegate", Opt_nsdelegate), fsparam_flag("nsdelegate", Opt_nsdelegate),
fsparam_flag("nonsdelegate", Opt_nonsdelegate),
fsparam_flag("memory_localevents", Opt_memory_localevents), fsparam_flag("memory_localevents", Opt_memory_localevents),
fsparam_flag("memory_nolocalevents", Opt_memory_nolocalevents),
fsparam_flag("memory_recursiveprot", Opt_memory_recursiveprot), fsparam_flag("memory_recursiveprot", Opt_memory_recursiveprot),
fsparam_flag("memory_norecursiveprot", Opt_memory_norecursiveprot),
{} {}
}; };
@ -1886,12 +1887,21 @@ static int cgroup2_parse_param(struct fs_context *fc, struct fs_parameter *param
case Opt_nsdelegate: case Opt_nsdelegate:
ctx->flags |= CGRP_ROOT_NS_DELEGATE; ctx->flags |= CGRP_ROOT_NS_DELEGATE;
return 0; return 0;
case Opt_nonsdelegate:
ctx->flags &= ~CGRP_ROOT_NS_DELEGATE;
return 0;
case Opt_memory_localevents: case Opt_memory_localevents:
ctx->flags |= CGRP_ROOT_MEMORY_LOCAL_EVENTS; ctx->flags |= CGRP_ROOT_MEMORY_LOCAL_EVENTS;
return 0; return 0;
case Opt_memory_nolocalevents:
ctx->flags &= ~CGRP_ROOT_MEMORY_LOCAL_EVENTS;
return 0;
case Opt_memory_recursiveprot: case Opt_memory_recursiveprot:
ctx->flags |= CGRP_ROOT_MEMORY_RECURSIVE_PROT; ctx->flags |= CGRP_ROOT_MEMORY_RECURSIVE_PROT;
return 0; return 0;
case Opt_memory_norecursiveprot:
ctx->flags &= ~CGRP_ROOT_MEMORY_RECURSIVE_PROT;
return 0;
} }
return -EINVAL; return -EINVAL;
} }